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  • Book Overview & Buying Learn React with TypeScript
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Learn React with TypeScript

Learn React with TypeScript - Second Edition

By : Carl Rippon
4.5 (20)
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Learn React with TypeScript

Learn React with TypeScript

4.5 (20)
By: Carl Rippon

Overview of this book

Reading, navigating, and debugging a large frontend codebase is a major issue faced by frontend developers. This book is designed to help web developers like you learn about ReactJS and TypeScript, both of which power large-scale apps for many organizations. This second edition of Learn React with TypeScript is updated, enhanced, and improved to cover new features of React 18 including hooks, state management libraries, and features of TypeScript 4. The book will enable you to create well-structured and reusable React components that are easy to read and maintain, leveraging modern design patterns. You’ll be able to ensure that all your components are type-safe, making the most of TypeScript features, including some advanced types. You’ll also learn how to manage complex states using Redux and how to interact with a GraphQL web API. Finally, you’ll discover how to write robust unit tests for React components using Jest. By the end of the book, you’ll be well-equipped to use both React and TypeScript.
Table of Contents (19 chapters)
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1
Part 1: Introduction
6
Part 2: App Fundamentals
10
Part 3: Data
14
Part 4: Advanced React

Testing pure functions

In this section, we will start by understanding the fundamental parts of a Jest test. Then, we will put this into practice by implementing tests on a pure function in the checklist component.

A pure function has a consistent output value for a given set of parameter values. These functions depend only on the function parameters and nothing outside the function, and also don’t change any argument values passed into them. So, pure functions are nice for learning how to write tests because there are no tricky side effects to deal with.

In this section, we will also cover how to test exceptions, which is useful for testing type assertion functions. Finally, at the end of this section, we will learn how to run the tests in a test suite.

Understanding a Jest test

Jest is preinstalled in a Create React App project and configured to look for tests in files with particular extensions. These file extensions are .test.ts for tests on pure functions...

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Learn React with TypeScript
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